1/* $OpenBSD: select.h,v 1.17 2016/09/12 19:41:20 guenther Exp $ */ 2 3/*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)select.h 8.2 (Berkeley) 1/4/94 32 */ 33 34#ifndef _SYS_SELECT_H_ 35#define _SYS_SELECT_H_ 36 37#include <sys/types.h> 38 39#ifndef _TIMEVAL_DECLARED 40#define _TIMEVAL_DECLARED 41struct timeval { 42 time_t tv_sec; /* seconds */ 43 suseconds_t tv_usec; /* and microseconds */ 44}; 45#endif 46 47#ifndef _TIMESPEC_DECLARED 48#define _TIMESPEC_DECLARED 49struct timespec { 50 time_t tv_sec; /* seconds */ 51 long tv_nsec; /* and nanoseconds */ 52}; 53#endif 54 55/* 56 * Select uses bit masks of file descriptors in longs. These macros 57 * manipulate such bit fields (the filesystem macros use chars). 58 * FD_SETSIZE may be defined by the user, but the default here should 59 * be enough for most uses. 60 */ 61#ifndef FD_SETSIZE 62#define FD_SETSIZE 1024 63#endif 64 65/* 66 * We don't want to pollute the namespace with select(2) internals. 67 * Non-underscore versions are exposed later #if __BSD_VISIBLE 68 */ 69#define __NBBY 8 /* number of bits in a byte */ 70typedef uint32_t __fd_mask; 71#define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */ 72#define __howmany(x, y) (((x) + ((y) - 1)) / (y)) 73 74typedef struct fd_set { 75 __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)]; 76} fd_set; 77 78static __inline void 79__fd_set(int fd, fd_set *p) 80{ 81 p->fds_bits[fd / __NFDBITS] |= (1U << (fd % __NFDBITS)); 82} 83#define FD_SET(n, p) __fd_set((n), (p)) 84 85static __inline void 86__fd_clr(int fd, fd_set *p) 87{ 88 p->fds_bits[fd / __NFDBITS] &= ~(1U << (fd % __NFDBITS)); 89} 90#define FD_CLR(n, p) __fd_clr((n), (p)) 91 92static __inline int 93__fd_isset(int fd, const fd_set *p) 94{ 95 return (p->fds_bits[fd / __NFDBITS] & (1U << (fd % __NFDBITS))); 96} 97#define FD_ISSET(n, p) __fd_isset((n), (p)) 98 99#if __BSD_VISIBLE 100#define FD_COPY(f, t) (void)(*(t) = *(f)) 101#endif 102#define FD_ZERO(p) do { \ 103 fd_set *_p = (p); \ 104 __size_t _n = __howmany(FD_SETSIZE, __NFDBITS); \ 105 \ 106 while (_n > 0) \ 107 _p->fds_bits[--_n] = 0; \ 108} while (0) 109 110#if __BSD_VISIBLE 111#define NBBY __NBBY 112#define fd_mask __fd_mask 113#define NFDBITS __NFDBITS 114#ifndef howmany 115#define howmany(x, y) __howmany(x, y) 116#endif 117#endif /* __BSD_VISIBLE */ 118 119#ifndef _KERNEL 120#ifndef _SIGSET_T_DEFINED_ 121#define _SIGSET_T_DEFINED_ 122typedef unsigned int sigset_t; 123#endif 124 125#ifndef _SELECT_DEFINED_ 126#define _SELECT_DEFINED_ 127__BEGIN_DECLS 128int select(int, fd_set * __restrict, fd_set * __restrict, 129 fd_set * __restrict, struct timeval * __restrict); 130int pselect(int, fd_set * __restrict, fd_set * __restrict, 131 fd_set * __restrict, const struct timespec * __restrict, 132 const sigset_t * __restrict); 133__END_DECLS 134#endif 135#endif /* !_KERNEL */ 136 137#endif /* !_SYS_SELECT_H_ */ 138